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Piper Su, seen here with her son, Elliot, lives in Alexandria, Va. She has registered with several transplant centers in hopes of increasing the odds of getting an organ.Courtesy of Piper Suhide caption

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At Urumqi's Grand Bazaar, a police officer chats with a local vendor while a video promoting China's ethnic minorities plays on a big screen overlooking the square. This was the site of Uighur protests in 2009 that sparked citywide riots, leading to the death of hundreds. Since then, the city has become one of China's most tightly controlled police states.Rob Schmitz/NPRhide caption

Piper Su, seen here with her son, Elliot, lives in Alexandria, Va. She has registered with several transplant centers in hopes of increasing the odds of getting an organ.Courtesy of Piper Suhide caption